run_test: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/run_test - from package: erlang-erts
/usr/lib64/erlang/bin/run_test - from package: erlang-erts

You may install the required package with command yum install {package}

Error in other languages:
run_test: bevel nie gevind nie
run_test: comandă negăsită
run_test: comando não encontrado
run_test: commande introuvable
run_test: command not found
run_test: käsku ei ole
run_test: không tìm thấy lệnh
run_test: komanda nerasta
run_test: Kommando nicht gefunden.
run_test: kommandot finns inte
run_test: komut yok
run_test: nie znaleziono polecenia
run_test: níor aimsíodh an t-ordú
run_test: no se encontró la orden
run_test: no s'ha trobat l'ordre
run_test: opdracht niet gevonden
run_test: parancs nem található
run_test: perintah tidak ditemukan
run_test: príkaz nenájdený
run_test: příkaz nenalezen
run_test: команда не найдена
run_test: командата не е открита
run_test: 命令找不到
run_test: コマンドが見つかりません